In Brief Dietitians, exercise physiologists, athletic trainers, and other sports medicine personnel commonly recommend that exercising adults and athletes refrain from caffeine use because it is a diuretic, and it may exacerbate dehydration and hyperthermia. This review, contrary to popular beliefs, proposes that caffeine consumption does not result in the following: (a) water-electrolyte imbalances or hyperthermia and (b) reduced exercise-heat tolerance. Authorities recommend that we avoid caffeine. Does caffeine use result in a fluid-electrolyte imbalance, hyperthemia, or heat intolerance?
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Armstrong et al. (2007) studied this question.
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